In this Dec. 5, 2014 file photo, Sen. Robert Menendez, D-N.J. speaks in Secaucus, N.J. Senate proponents of a bill empowering Congress to review and potentially reject any Iran nuclear deal must first win a battle with some colleagues determined to change

In this April 2, 2015 file photo, President Barack Obama speaks the Rose Garden of the White House in Washington about the breakthrough in the Iranian nuclear talks. Senate proponents of a bill empowering Congress to review and potentially reject any Iran

WASHINGTON (AP) — The Senate plunges into a high-stakes debate this week over empowering Congress to review and possibly reject any nuclear deal with Iran, offering Republican presidential candidates a chance to prove their hawkishness toward Iran and support for Israel.

Sen. Marco Rubio of Florida wants to add a provision requiring the Obama administration to certify that Iran'sleaders have publicly accepted Israel's right to exist, a nearly impossible mandate.

Sen. Ted Cruz of Texas isn't satisfied with the bill's process in which Congress could disapprove of the deal. He and Sen. Pat Toomey of Pennsylvania want lawmakers to approve the final deal.

Wendy Sherman, under secretary of state for political affairs, on Monday strongly defended the Obama administration's negotiations with Iran, saying that without an agreement, Tehran could be able to develop a nuclear weapon in two to three months.

In a speech at a conference of the Religious Action Center of Reform Judaism in Washington, Sherman said the president would have to reconsider his decision to support the bill if it is distorted with amendments.

"There will be a lot of pretty awful amendments, quite frankly, and we'll see where we end up," Sherman said. "If it becomes something else, he will have to consider his options."

Proponents of the bill are trying to discourage any changes to the legislation that has the tacit approval of President Barack Obama. They recognize that politically-driven amendments could undermine Democraticsupport and sink the carefully crafted measure.

"Anybody who monkeys with this bill is going to run into a buzz saw," Republican Sen. Lindsey Graham of South Carolina, a possible White House candidate, warned ahead of this week's debate.

Amendments and full debate begin Tuesday.

Also trying to caution against changes, Democratic Sen. Bob Menendez of New Jersey urged senators to stick with the plan as it emerged from the Senate Foreign Relations Committee.

The debate comes as negotiators from the U.S. and five other nations are rushing to finalize, by the end of June, an agreement requiring Iran to curb its nuclear program in exchange for relief from sanctions choking its economy. The parties will meet again this week at the same time as a U.N. conference in New York.

The bill was approved, 19-0, by the Senate committee and has 62 co-sponsors from both parties.

Some lawmakers, however, want changes that could cost them the support of President Barack Obama, who grudgingly backed the measure, and his fellow Democrats.

If there is a final deal with Iran, Obama can use his executive authority to ease some sanctions on his own and work with the European Union and the United Nations to lift others. Obama also can waive sanctions that Congress has imposed on Iran, but he cannot formally lift them.

The bill would block Obama from waiving congressional sanctions for at least 30 days while lawmakers weigh in.

If 60 senators vote to disapprove of the deal, Obama would lose his waiver power altogether. The president is betting he will not.

If Congress disapproves, the president will almost certainly respond with a veto. As long as he can get more than one-third of the Senate to side with him, he can prevent his veto from being overridden.

Backers of the bill are trying to keep lawmakers focused on how it would give Congress a say on a critical national security issue. They say the measure is not meant to be about how Iran increasingly is wielding influence in the Middle East, its support of terrorist groups or human rights violations. They worry that adding too many divisive amendments would cause Democrats to drop their support.

Even so, some senators are proposing amendments to pressure Iran to end its support of such groups, stop threatening to destroy Israel and recognize its right to exist, and release U.S. citizens held in Iran.

Other amendments would prevent sanctions relief if Iran cooperates with nuclear-armed North Korea, or until international nuclear inspectors are guaranteed access to Iranian military sites.

An amendment from Sen. Ron Johnson, R-Wis., would make any deal a treaty, thus needing to be ratified by two-thirds of the Senate.

"The president should have to get 67 votes for a major nuclear arms agreement with an outlaw regime," said Sen. Tom Cotton, R-Ark.

Cotton wants to lower the number of votes needed to reject a deal from 60 to 51. That means opponents of any deal would only need Republican votes to sink it.

He also wants to see amendments requiring that Congress be notified of any violations of an agreement, not just ones that are legally defined as material breaches.

A third set of amendments would prevent sanctions relief until they meet goals the U.S. established at the beginning of the negotiations. Critics of the talks claim the administration has backtracked and agreed to too many concessions for Iran.

Republican Sen. Bob Corker of Tennessee, the committee chairman and a co-author of the bill, said he too would like to see Iran change its behavior and he wants any final deal to be a good one that will prevent Iranfrom developing nuclear weapons. But he said that's not what the bill is about.

"This bill is about the process," Corker said. "It's not a bill about the content of any deal, and hopefully, that's how the bill will remain."

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